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Figure 3 Combined receiver operating characteristic (ROC) curves for amino-terminal pro-brain natriuretic peptide (NT-proBNP), galectin (gal)-3 and apelin for 60-day mortality in heart failure. The ROC analysis showed an area under the curve (AUC) for gal-3 of 0.74 (p = 0.0001), an AUC for NT-proBNP of 0.67 (p = 0.009), and an AUC for apelin of 0.54 (p = 0.33).